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研究贵州中部喀斯特石漠化地区不同植被群落土壤和小生境土壤中有机碳的数量和质量变化。结果表明:喀斯特石漠化区阔叶林土壤有机总碳含量和腐殖酸碳含量明显高于灌木林、灌草丛和稀疏草丛,而土壤水溶性有机碳含量的变化则相反;喀斯特森林退化后,土壤有机碳的累积量减少、流失量增加;喀斯特小生境土壤有机总碳和腐殖酸碳含量存在明显的水平空间变异:石坑>石沟>石缝>石洞。主成分分析结果表明:喀斯特土壤有机碳变化的第1主要因子由植被类型决定,第2主要因子由小生境类型所决定。
This paper studied the changes of organic carbon in soils and niches of different vegetation communities in the karst rocky desertification area of Guizhou province. The results showed that the content of total organic carbon and humic acid in broad-leaved forest in karst rocky desertification area were significantly higher than those in shrubs, shrubs and sparse grasslands, while the changes in soil water-soluble organic carbon were opposite. After the karst forest was degenerated , The soil organic carbon accumulation decreased, and the loss increased. The total organic carbon and humic acid carbon content in the karst niche had obvious horizontal spatial variability: stone pit> stone ditch> stone crevice> stone cave. The principal component analysis showed that the first major factor of Karst soil organic carbon change was determined by vegetation type, and the second major factor was determined by niche types.